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(ModeL) 2 Sheets-Sheet 2.

D. W. AMOS.

- STBA M ENGINE. No: 311,708. Patented Feb. 3, 1885.

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SPECIFICATION forming part. of Letters Patent No. 311,708, datedFebruary 3, 1885.

Application filed June 12, 1884. (Modch) To ail whom it may concern.-

Be it known that I, DANIEL W. AMOS, a citizen of the United States,residing at Saxton, in the county of Bed ford and State of Pennsylvania, have invented certain new and useful Improvements inSteam-Engines; and I do declare the following to he a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to letters or figures ofreference marked thereon, which form a part of this specification.

Figure l of the drawings is a side view. Fig. 2 is a plan view. Fig. 3is avertical sectional view. Fig. 418 a transverse sectional view of thesame, and Figs. 5 and 6 are detail views.

The invention relates to oscillating steamengines, and its novel anduseful feature is the making of the ports of the cylinder open on theconvex face of a cylindrical segment, the said segment being situatedvertically above, and secured to, the cylinder, and having the centerofits are coincident with the central transverse line of the trunnionsupon which the cylinder oscillates. The ports ot'the steanr chest whichare vertically above the cylinder,

"to proper bearings for the trunnions I) b of the cylinder B, the saidtrunnions being somewhat nearer the front end of the cylinder than tothe rear end, so as to counterbalance the weight of the piston-rod G.

D is the crank-shaft of the engine, turning in proper bearings fixed t0the bed A,.connected with the pist0n-rod G by the crank d, and havingproperly attached the fly-Wheel c.

E is the segment of a cylinder fixed to the steam-cylinder B, verticallyabove the same, or cast in one piece with it. The upper surface, 6, ofthe said segment is made on the arc of a circle the center of which iscoincident with the central longitudinal line of thetrunnions b b.

F F are the ports from the front and rear ends of the cylinder,respectively. These ports open at the points f and f on the con vexsurface of the segment.

G G are equal and similar uprights standing from the bed of the engineat opposite points on each side of the cylinder B, the upper ends ofwhich are flattened and extended horizontally frontward and backward,and have pass ing through said extensions, on each side, the screws 9 g,&c., which bind the steam-chest on the uprights and bring its concavelower surface to bear on the convex upper surface of the segment E.

H is the steam-chest, the lower concave surface, 72, of which his on theupper convex surface, (2, of the segment E, and provided with the frontand rear steam-ports, h and if, respectively, and the exhaustport h,situated between and equally distant from both.

I I are leat springs resting on top of the steam-chest, on each side ofthe same, and having their concavity downward. Each leafspring I haspassing through its center the screw 2'', which enters the top of anupright, G, and serves to depress the spring, and con sequently thesteam-chest, on which the spring rest-s,so as to bring the concavesurface h of said chest intoclose contact with the convex surface c ofthe segment E and make them steamtight without causing too muchfriction, as the springs will give sufficiently to allow the segment andattached cylinder to oscillate.

The operation of the engine is sufficiently evident from thedescription, for as the front port, F, of the cylinder oscillates underthe port h" of the steam-chest it will exhaust into the same, the rearport, F, at the same time taking steam from the port h" of the steamchest. Any wear between the faces h and eis easily remedied by means ofthe screws and leaf-springs I I.

Having thus fully described my invention, what I claim as new. anddesire to secure by Letters Patent, is

1. In an oscillating steam-engine, the coinbination, with the cylinderB,'segment E, uprights G G, and steam-chest H, of the springs I I andscrews 13 t, substantially as specified.

2. An oscillating steam-engine having its cylinder provided on its upperside with a fixedsegment, in combination with a steamchest having anengaging concave face, and provided with springs adapted to keep thesaid cylinder pressed down upon the said segment,

substantially as specified.

3. The combination,withthe frame supporting the steam-cylinder havingthe vertical standards, of the steam-cylinder having the segmentalportion, the steam-chest, springs for pressing the steam-chest in thedirection of the cylinder, and means for connecting the chest with thesaid standards,substantially as specified,

4. The combination, with the steam-cylinder having the segmental portionand means for supporting the same, of a steam-chest provided with springengaging devices, and means of adjusting the tension of the spring,whereby the said steam-chest may be kept in engagement with thesegmental portion of the cylinder, substantially as specified.

In testimony whereof I aflix my signature in presence of two witnesses.

D. W. AMOS.

Witnesses:

J. C. MOORE, (l. O. NELsoN,

